From c4e92faaf7bbad53abd6e3ed01f7ecc67549e165 Mon Sep 17 00:00:00 2001
From: Sam Fredrickson <samfredrickson@gmail.com>
Date: Wed, 1 Mar 2023 01:03:31 -0800
Subject: [PATCH] Fix wait condition and ordering in send().

---
 precise/lib.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/precise/lib.go b/precise/lib.go
index 171f1fb..82fa01d 100644
--- a/precise/lib.go
+++ b/precise/lib.go
@@ -138,12 +138,12 @@ func (s *state[T]) send(value T, buf *circ.B[T], cond *sync.Cond) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	for {
+		for !s.closed && !buf.CanPush() {
+			cond.Wait()
+		}
 		if s.closed {
 			panic("send on closed queue")
 		}
-		for !buf.CanPush() {
-			cond.Wait()
-		}
 		if buf.CanPush() {
 			buf.PushBack(value)
 			s.canRecv.Broadcast()